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混凝土结构在动力作用下的非线性行为受加载速率的影响较大。为了研究混凝土在动力作用下应变率效应以及这种效应对随机性的影响,进行了强度等级为C30~C60的普通混凝土棱柱体试件在8个不同应变速率(10-5/s~10-1/s)下的单轴受压应力-应变全过程大样本试验研究(共418个)。试验采用MTS815力学性能试验系统,针对每一工况,对同强度同批浇筑的约16个试件进行相同应变速率的加载。试验获得了不同强度、不同加载速率下混凝土的单轴受压应力均值-应变曲线和应力标准差-应变曲线、峰值应力和峰值应变的统计特征值。研究结果表明:加载速率对混凝土的单轴受压应力均值-应变曲线的影响最为明显,对混凝土的单轴受压应力标准差-应变曲线、峰值应力标准差、峰值应变均值和标准差的影响均不明显。
The nonlinear behavior of concrete structures under dynamic load is greatly affected by the loading rate. In order to study the strain rate effect of concrete under dynamic action and the effect of this effect on the randomness, normal concrete prismatic specimens of strength grade C30 ~ C60 were tested at eight different strain rates (10-5 / s ~ 10- 1 / s) uniaxial compressive stress - strain large-scale large-scale experimental study (418). The test uses MTS815 mechanical performance test system. For each condition, about 16 specimens with the same strength are loaded with the same strain rate. The uniaxial compressive stress mean value-strain curve, stress standard deviation-strain curve, peak stress and peak strain of concrete under different intensities and different loading rates were obtained. The results show that the loading rate has the most obvious influence on the uniaxial compressive stress-strain curve of concrete. The influence of uniaxial compressive stress standard deviation-strain curve, standard peak stress, peak mean strain and standard deviation Not obvious.